Preheat oven to 350 degrees.,Grease a square 8x8 pan.,Sift flour with sugar, salt, and cocoa.,Add Butter, eggs, and vanilla.,Use spoon and beat 100 strokes per minute for 3 minutes by hand or 2 minutes on medium speed with mixer.,______,Pour into pan and spread out evenly.,Bake 20 to 22 minutes.,Cool and then cut.